Use proper platform specific file when building on win32 with gmake. Fixing crash on startup problem.

netwerk/base/src/Makefile.in

@@ -72,9 +72,13 @@ CPPSRCS		= \
 
 ifeq ($(MOZ_WIDGET_TOOLKIT),os2)
 	CPPSRCS += nsIOServiceOS2.cpp
+else
+ifeq ($(MOZ_WIDGET_TOOLKIT),windows)
+	CPPSRCS += nsIOServiceWin.cpp
 else
 	CPPSRCS += nsIOServiceUnix.cpp
 endif
+endif
 
 JSFILES		= \
 		$(srcdir)/nsProxyAutoConfig.js \